A comparison of judgements of vibration intensity for chest-to-back (X-axis) and side-to-side (Y-axis) exposures: R. W. Shoenberger 1973 Wright-Patterson Air Force Base, AMRL-TR-73-32 (10 pages, 2 figures, 1 table, 8 references)
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 62 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The subjective intensity of vibration in the two primary horizontal axes (X-axis, chest-to-back; and Y-axis, side-to-side) was compared through an intensity matching procedure. Unrestrained seated subjects matched their judgements of vibration intensity in one axis (Xor Y) by adjusting the intensity ofvibration in the other axis until it was subjectively equal to the first: Each of eight subjects made a series of intensity judgements which were counterbalanced so that half of the matches were with an X-axis stimulus and a Y-axis response, and the other half were with a Y-axis stimulus and an X-axis response. Vibration was sinusoidal at 5, 7, I0, 15, 20 and 30 Hz. Peak accelerations at each frequency ranged from a lower limit of 0.1 g to upper limits of 0.5 to 1.3 g (depending on frequency). Each vibration stimulus had a duration of 20 seconds. Results showed that, within the limits of the vibration parameters sampled, X-axis vibration was judged to be slightly but consistently more intense than Y-axis vibration. However, expressed in terms of acceleration, the difference is quite small (about 0.035 g on the average), and does not appear great enough to justify separate intensity criteria for X-and Y-axis vibration. Topics: Subjective Assessment (bltensity Matchhlg); Non-vertical Vibration (+_ax, +_at).